std::memchr in C++

C++ offers various standard template libraries to be used. One of them is memchr() function which will search for the first occurrence of a character in a specified number of characters.Template

const void* memchr( const void* ptr, int ch, std::size_t count );Parameters : ptr : Pointer to the object to be searched for.
ch : Character to search for.
count : Number of character to be searched for.
Return value:
If the character is found, the memchr() function returns a pointer to
the location of the character, otherwise returns null pointer.

// CPP program to illustrate memchr()

#include <cstring>

#include <iostream>

usingnamespacestd;

intmain()

{

charsr[] = "This is a sample";

charch = 's';

intcount = 13;

if(memchr(sr, ch, count))

cout << ch << " is present in first "

<< count << " characters of \""<< sr << "\"";

else

cout << ch << " is not present in first "

<< count << " characters of \""<< sr << "\"";

return0;

}

Output:

s is present in first 13 characters of "This is a sample"

Example:

// CPP program to illustrate memchr()

#include <iostream>

#include <cstring>

intmain()

{

chararr[] = { 'b', 'a', 'd', 'e', 'f', 'A', 'g'};

char* pc = (char*)std::memchr(arr, 'g', sizeofarr);

if(pc != NULL)

std::cout << "search character found\n";

else

std::cout << "search character not found\n";

}

Output:

search character found

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